Transformer bushing head structure

Abstract

The utility model discloses a transformer bushing head structure which comprises a cover plate installed on an oil conservator and a wire holder installed on the cover plate, a conductive head is installed on the wire holder, and a wiring terminal is installed on the conductive head. The top end of the conductive tube penetrates through the cover plate and the wire holder and extends into the cavity; a lead connector is screwed at the inner bottom of the conductive head, a check nut is screwed on the lead connector, and the check nut abuts against the inner bottom surface of the conductive head; corresponding pin holes are formed in the lead connector and the check nut, and a bolt for connecting the lead connector and the check nut into a whole is inserted into the pin holes; the lead connector is inserted into the conductive tube and is attached to the inner wall of the conductive tube, and an insulating supporting ring used for supporting and tightening the nut is further arranged in the cavity of the wire holder. According to the head structure, the current-carrying capacity of the sleeve is ensured, the operation safety is improved, meanwhile, the types of parts are reduced, and assembly is convenient.

Description

Technical Field

[0001] This utility model relates to a transformer bushing head structure, belonging to the field of bushing technology. Background Technology

[0002] The existing head structure of oil-paper capacitor transformer bushings is mainly applicable to cable-type transformer bushings. This structure has a variety of parts such as rain cover, elastic plate, and pressure ring, which increases the assembly difficulty. Furthermore, the lead connector and the conductive head use a threaded fit to carry current, but the threaded current carrying requires a high degree of thread fit. If the connection is not good, it will lead to poor current carrying and cause the bushing to heat up. Utility Model Content

[0003] The purpose of this utility model is to provide a transformer bushing head structure that ensures the current carrying capacity of the bushing, improves operational safety, reduces the number of parts, and facilitates assembly.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A transformer bushing head structure includes a cover plate mounted on an oil conservator and a terminal block mounted on the cover plate. A conductive head is mounted on the terminal block, and a terminal is mounted on the conductive head. The terminal block has a cavity, and the top end of a conductive tube passes through the cover plate and the terminal block and extends into the cavity.

[0006] The inner bottom of the conductive head is screwed with a lead connector, and a tightening nut is screwed on the lead connector. The tightening nut abuts against the inner bottom surface of the conductive head. Corresponding pin holes are opened on the lead connector and the tightening nut, and a pin is inserted into the pin hole to connect the lead connector and the tightening nut into one piece.

[0007] The lead connector is inserted into the conductive tube and fits against the inner wall of the conductive tube. An insulating support ring is also provided in the cavity of the terminal block to support and tighten the nut.

[0008] Preferably, the outer wall of the insulating support ring is fitted with the inner wall of the cavity, the bottom surface is fitted with the bottom of the cavity, and the top surface is fitted with the bottom surface of the tightening nut.

[0009] Preferably, a first sealing ring is installed at the contact surface between the oil reservoir and the cover plate.

[0010] Preferably, a second sealing ring is installed at the contact surface between the conductive tube and the cover plate.

[0011] Preferably, a third sealing ring is installed at the contact surface between the cover plate and the terminal block.

[0012] Preferably, a fourth sealing ring is installed at the common contact surface of the conductive tube, the cover plate, and the terminal block.

[0013] Preferably, a fifth sealing ring is installed at the contact surface between the conductive tube and the terminal block.

[0014] Preferably, a sixth sealing ring is installed at the contact surface between the conductive head and the terminal block.

[0015] Preferably, the pin passes through the lead connector and tightens the nut.

[0016] The beneficial effects of this utility model are as follows:

[0017] This head structure eliminates components such as the rain cover, elastic plate, and pressure ring, simplifying the parts and reducing the difficulty of bushing assembly. A small cavity is provided on the terminal block, where the tightening nut on the lead connector is recessed. The pin on the tightening nut is confined within the cavity to prevent loosening and falling off. Simultaneously, an insulating support ring supports the tightening nut to prevent axial displacement, ensuring a good connection between the lead connector and the conductive head and preventing overheating due to poor current carrying capacity of the bushing. Multiple seals are also incorporated to ensure the sealing requirements of the bushing head structure. Attached Figure Description

[0018] Figure 1 This is a half-section diagram of the head structure.

[0019] The meanings of the main reference numerals in the figure are as follows:

[0020] 1. Oil reservoir, 2. Cover plate, 3. Terminal block, 4. Conductive head, 5. Terminal block, 6. Lead wire connector, 7. Tightening nut, 8. Pin, 9. Insulating support ring, 10. First sealing ring, 11. Second sealing ring, 12. Third sealing ring, 13. Fourth sealing ring, 14. Fifth sealing ring, 15. Sixth sealing ring, 16. Conductive tube. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] This embodiment provides a transformer bushing head structure, see [link]. Figure 1 As shown, it includes a cover plate 2 installed on the oil tank 1 and a terminal block 3 installed on the cover plate 2. A conductive head 4 is installed on the terminal block 3, and a terminal block 5 is installed on the conductive head 4. The terminal block 3 has a cavity, and the top end of the conductive tube 16 passes through the cover plate 2 and the terminal block 3 and extends into the cavity.

[0023] A lead connector 6 is screwed onto the inner bottom of the conductive head 4, and a tightening nut 7 is screwed onto the lead connector 6. The tightening nut 7 abuts against the inner bottom surface of the conductive head 4. Corresponding pin holes are opened on the lead connector 6 and the tightening nut 7, and a pin 8 is inserted into the pin hole to connect the lead connector 6 and the tightening nut 7 into one piece. In order to prevent the pin 8 from undergoing large radial displacement (relative to the lead connector 6 and the tightening nut 7), the pin 8 is set to pass through the lead connector 6 and the tightening nut 7. More preferably, both ends of the pin 8 abut against the inner wall of the cavity.

[0024] The lead connector 6 is inserted into the conductive tube 16 and fits against the inner wall of the conductive tube 16. An insulating support ring 9 is also provided in the cavity of the terminal block 3 to support the tightening nut 7, preventing axial displacement of the integrated lead connector 6 and tightening nut 7. Specifically, the outer wall of the insulating support ring 9 fits against the inner wall of the cavity, the bottom surface fits against the bottom of the cavity, and the top surface fits against the bottom surface of the tightening nut 7. The conductive tube 16 can be inserted into the insulating support ring 9.

[0025] To ensure a tight seal, the head structure is equipped with multiple seals. Specifically, a first sealing ring 10 is installed at the contact surface between the oil conservator 1 and the cover plate 2. A second sealing ring 11 is installed at the contact surface between the conductive tube 16 and the cover plate 2. A third sealing ring 12 is installed at the contact surface between the cover plate 2 and the terminal block 3. A fourth sealing ring 13 is installed at the common contact surface between the conductive tube 16 and the cover plate 2 and the terminal block 3. A fifth sealing ring 14 is installed at the contact surface between the conductive tube 16 and the terminal block 3. A sixth sealing ring 15 is installed at the contact surface between the conductive head 4 and the terminal block 3.

[0026] During assembly, place the first sealing ring 10 in the sealing groove above the oil conservator 1, and the second sealing ring 11 in the sealing groove inside the cover plate 2. Apply transformer oil to the smooth part at the upper end of the conductive tube 16 for lubrication. Then, slide the cover plate 2 over the upper end of the conductive tube 16 and tighten the cover plate 2 and the oil conservator 1 with bolts to seal them. Place the third sealing ring 12 and the fourth sealing ring 13 in the corresponding sealing grooves above the cover plate 2, and the fifth sealing ring 14 in the sealing groove inside the terminal block 3. Slide the terminal block 3 over the upper end of the conductive tube 16 and tighten the terminal block 3 onto the cover plate 2 of the oil conservator 1 with bolts to seal it. Screw the tightening nut 7 onto the lead connector 6, then insert the pin 8, and screw the lead connector 6 onto the conductive head 4. Tighten the conductive head 4 and the tightening nut 7, and finally, use standard parts to fix the terminal 5 onto the conductive head 4. Insert the insulating support ring 9 into the cavity, then place the sixth sealing ring 15 into the sealing groove above the terminal block 3, then insert the lead wire connector 6 from the upper end of the conductive tube 16, and finally use bolts to tighten the conductive head 4 onto the terminal block 3 for sealing.

[0027] The above description is only a preferred embodiment of this utility model patent. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model patent, and these improvements and modifications should also be considered within the scope of protection of this utility model patent.

Claims

1. A transformer bushing head structure, characterized in that, It includes a cover plate installed on the oil tank and a terminal block installed on the cover plate. The terminal block is equipped with a conductive head and a terminal block. The terminal block has a cavity, and the top end of the conductive tube passes through the cover plate and the terminal block and extends into the cavity. The inner bottom of the conductive head is screwed with a lead connector, and a tightening nut is screwed on the lead connector. The tightening nut abuts against the inner bottom surface of the conductive head. Corresponding pin holes are opened on the lead connector and the tightening nut, and a pin is inserted into the pin hole to connect the lead connector and the tightening nut into one piece. The lead connector is inserted into the conductive tube and fits against the inner wall of the conductive tube. An insulating support ring is also provided in the cavity of the terminal block to support and tighten the nut.

2. The transformer bushing head structure according to claim 1, characterized in that, The outer wall of the insulating support ring is fitted with the inner wall of the cavity, the bottom surface is fitted with the bottom of the cavity, and the top surface is fitted with the bottom surface of the tightened nut.

3. The transformer bushing head structure according to claim 1, characterized in that, A first sealing ring is installed at the contact surface between the oil reservoir and the cover plate.

4. The transformer bushing head structure according to claim 1, characterized in that, A second sealing ring is installed at the contact surface between the conductive tube and the cover plate.

5. The transformer bushing head structure according to claim 1, characterized in that, A third sealing ring is installed at the contact surface between the cover plate and the terminal block.

6. The transformer bushing head structure according to claim 1, characterized in that, A fourth sealing ring is installed at the common contact surface of the conductive tube, the cover plate, and the terminal block.

7. The transformer bushing head structure according to claim 1, characterized in that, A fifth sealing ring is installed at the contact surface between the conductive tube and the terminal block.

8. The transformer bushing head structure according to claim 1, characterized in that, A sixth sealing ring is installed at the contact surface between the conductive head and the terminal block.

9. The transformer bushing head structure according to claim 1, characterized in that, The pin passes through the lead connector and tightens the nut.

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